Connected: An Internet Encyclopedia
RFC 1812 - D.4 Protocol Independent Multicast - PIM

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### D.4 Protocol Independent Multicast - PIM

PIM, currently under development, is a multicast routing protocol that runs over an existing unicast infrastructure. PIM provides for both dense and sparse group membership. It is different from other protocols, since it uses an explicit join model for sparse groups. Joining occurs on a shared tree and can switch to a per-source tree. Where bandwidth is plentiful and group membership is dense, overhead can be reduced by flooding data out all links and later pruning exception cases where there are no group members.

Next: APPENDIX E Additional Next-Hop Selection Algorithms

Connected: An Internet Encyclopedia
RFC 1812 - D.4 Protocol Independent Multicast - PIM